Patent US4428591A successfully refreshed from Google Patents.
US4428591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic pipe provided with a groove
Assignee: Wavin BV
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Filing: 1982-05-17
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Granted: 1984-01-31
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Expires: 2002-05-17
Abstract
Abstract A plastic pipe comprises an inner wall and an outer wall, being integral with longitudinal partitions betweem them and bounding longitudinally extending channels and a circumferential, helically or non-helically extending groove, which groove has been formed by closing the channels by pressing channel wall parts onto each other. A retaining ring may be snapped into an external groove.
Inventors
- 👤 Roelof H. Marissen
- 👤 Joannes H. Beune
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:13
CPC Classifications
B; B29; B29C; B29C67/00; B29C67/0014; B29C57/00; F; F16; F16L; F16L47/00; F16L47/06; B29L; B29L2024/00; B29L2024/006; B29L2031/00; B29L2031/60; B29L2031/601; Y; Y10; Y10S; Y10S425/00; Y10S425/218; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49881
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
63 words
A plastic pipe comprising an inner wall and an outer wall, having longitudinal partitions in between them and being integral with said inner wall and said outer wall, bounding longitudinally extending channels and a helically extending internal groove, made by pressing channel walls onto each other at least at a distance from the pipe end and maintaining the channels beside the internal groove.
Claim 2
Dependent Claim
63 words
A plastic pipe comprising an inner wall and an outer wall, having longitudinal partitions in between them and being integral with said inner wall and said outer wall, bounding longitudinally extending channels and a helically extending internal groove, made by pressing channel walls onto each other at least at a distance from the pipe end and maintaining the channels beside the internal groove.
Claim 3
Dependent Claim
20 words
The plastic pipe according to claim 1, in which the cross-section of the longitudinally extending channels is a rounded shape.
Claim 4
Dependent Claim
73 words
A plastic pipe connection including a first plastic pipe according to claim 1 comprising: a second penetrating plastic pipe connected to the first plastic pipe, said second plastic pipe having an inner wall and an outer wall with longitudinal partitions in between them and being integral with said inner wall and said outer wall, bounding longitudinally extending channels, and a groove being complimentary to the helically extending groove in the first plastic pipe.
References Cited (Backward Citations)
US4341392A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-30 | 1987-08-01 | 1988-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-30 | 1991-08-01 | 1992-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-30 | 1995-08-01 | 1996-01-31 | $7700.00 | Window Closed / Lapsed |